Who are the richest human beings ever? We've been researching this article for the last week so get ready to have your mind blown by these mega mega billionaires. The 25 people on this list are the wealthiest human beings to ever walk the earth. We started off with roughly 50 people then finalized the top 25 after adjusting for inflation to convert the fortunes into 2013 dollars. For example, the annual rate of inflation change between 1913 and 2013 is 2199.6% so $100 million in 1913 would be equal to $2.299.63 billion in 2013 dollars. We also used the most recent price for an ounce of gold which is roughly $1330 as of October 10, 2013.

In addition to some familiar modern names like Bill Gates and Warren Buffett, our list features older magnates like Vanderbilt and Carnegie. We also included lesser known billionaires from history that you may have never even heard of before. We guarantee the #1 person on this list will make your jaw drop.

John D. Rockefeller / General Photographic Agency/Getty Images

Fun Facts About The Richest People Who Ever Lived:

These billionaires control a combined $4.317 trillion!

The richest people ever are all men. Sadly No women cracked the top 25.

14 out of the 25 people are Americans.

Bill Gates is the richest American and the richest person still alive on this list.

Carlos Slim Helu, the former richest person in the world, did not even crack the top 20.

So sit back, get a drool bucket and click the image below to launch the ultimate gallery of the richest people who ever lived, inflation adjusted.

The 25 Richest People of All Time:

#1: Mansa Musa I – $400 Billion

Mansa Musa I of Mali is the richest human being in history with a personal net worth of $400 billion! Mansa Musa lived from 1280 – 1337 and ruled the Malian Empire which covered modern day Ghana, Timbuktu and Mali in West Africa. Mansa Musa's shocking wealth came from his country's vast production of more than half the world's supply of salt and gold. Musa used his wealth to build immense mosques that still stand today, nearly 700 years later. His kingdom and wealth didn't last much longer after his death. His heirs were not able to fend off civil war and invading conquerors. Just two generations later, his world record net worth was gone.

#2 The Rothschild Family – $350 Billion

The Rothschild family are the richest people on earth today with assets that total at least $350 billion. Their net worth is difficult to peg because their holdings are so vast, but without question they are the most powerful family in the world. Many people believe they control over $1 trillion in real estate and banking assets alone.

#3 John D. Rockefeller – $340 Billion

John D. Rockefeller is the richest American who ever lived. At the time of his death in 1937, Rockefeller was worth the equivalent of $340 billion in today's dollars. His company Standard Oil dominated American Oil production and was eventually broken up by The US Government for being a monopoly. Standard Oil was broken into smaller companies that you probably recognize today: Amoco, Chevron Conoco, and ExxonMobil. Rockefeller was the first American to ever have a net worth over $1 billion.

#4 Andrew Carnegie – $310 Billion

Andrew Carnegie made his vast fortune when he sold his Carnegie Steel Company to JP Morgan for $480 million in 1901. That equates to a peak net worth equivalent to $310 billion in modern dollars. When he sold his company to JP Morgan, Carnegie took home $230 million worth of gold bonds and received a 5% annual coupon to top it off. The bonds sat in a bank in New Jersey which Carnegie never visited. After selling his company, Carnegie retired from business life and dedicated his time to charity. He gave away the majority of his fortune during his lifetime and his final $30 million was donated after his death. Many universities and foundations still bear his name today.

#5 Nikolai Alexandrovich Romanov – $300 Billion

Nikolai Alexandrovich Romanov, also known as Tsar Nicholas II of Russia, ruled the Russian empire from 1894 to 1917 when Bolshevik revolutionists overthrew and murdered him and his family. In 1916, Tsar Nicholas II's net worth was nearly $900 million which is the inflation adjusted equivalent to $300 billion in 2012 dollars. $300 billion makes him the fifth richest person in history and since the Russian Orthodox canonized him, he is the richest saint in human history.

#6 Mir Osman Ali Khan – $230 billion

Mir Osman Ali Khan, also known as The Nizam of Hyderabad, was the ruler of Hyderabad until the country was invaded by neighbor India. Mir Osman Ali Khan had a personal collection of gold that was worth more than $100 million and owned over $400 million worth of jewels including the famous Jacob Diamond which is worth $95 million today. Khan used the diamond as a paperweight in his office. He supposedly owned more than 50 Rolls Royces.

#7 William The Conqueror – $229.5 Billion

William The Conqueror lived from 1028-1087 and was most famous for invading and subsequently seizing England in 1066. When you spend a lifetime conquering other kingdoms, you tend to acquire quite a bit of money. In Williams case, when he died he left the equivalent of $229.5 billion to his sons.

#8 Muammar Gaddafi – $200 Billion

After his death in 2011, reports surfaced that Muammar Gaddafi was secretly the wealthiest person in the world with a net worth of $200 billion. In the months surrounding his death nearly $70 billion in cash was seized in foreign bank accounts and real estate. Muammar Gaddafi's iron fisted rule over Libya's oil fields made up the rest of his net worth.

#9 Henry Ford – $199 Billion

Ford motor company founder Henry Ford built an iconic brand which we all still know and see today. At the time of death in 1947, he had accumulated a net worth equivalent to $199 billion modern dollars.

#10 Cornelius Vanderbilt – $185 Billion

Cornelius Vanderbilt is the third richest American ever, the 10th richest person in history and CNN anchor Anderson Cooper's great-great-great-grandfather. Cornelius Vanderbilt made his first fortune in the steamboat industry but didn't see his wealth really explode until he invested in railroads at the age of 70. When he died, his estate was worth the equivalent of $185 billion.

#11 Alan Rufus – $178.65 billion

Alan Rufus was the 11th century military companion of William The Conqueror. Going to war with William was a very profitable endeavor. Rufus was given 250,000 acres of land in England, which at the time was worth the equivalent to $178.65 billion.

#12 Bill Gates – $136 Billion

At the peak of the dotcom bubble, Gates' Microsoft stock soared, giving him a net worth equal to $136 billion in today's dollars. That's enough to make him the 12th richest human ever.

#13 William de Warenne – $147.13 Billion

William de Warenne, the first Earl of Surey was an English military leader and nobleman who was awarded large grants of land for his service during the battle of Hastings. That land was worth the equivalent of $146.13 billion in 1088.

#14 John Jacob Astor – $121 Billion

John Jacob Astor has the honorable distinction of being the very first American multi-millionaire in history. He made his first million by trading furs from Canada to wealthy women in New York City. He used his money to acquire vast amounts of real estate and had a net worth equivalent to $121 billion when he died in 1848.

#15 Richard Fitzalan 10th Earl of Arundel – $118.6 Billion

The 10th Earl of Arundel also known as Richard Fitzalan, was a prominent English nobleman and land owner who had a net worth equivalent to $118.6 billion at the time of his death in 1376.

#16 John of Gaunt – $110 Billion

John of Gaunt was English King Richard II's Regent and had a net worth equal to $110 billion in today's dollars thanks to very generous land grants.

#17 Stephen Girard – $105 Billion

French born shipping and banking mogul Stephen Girard died with the equivalent of $105 billion in 1831. Girard didn't have any heirs so he left the bulk of his estate to charity.

#18 A.T. Stewart – $90 Billion

Alexander Turney Stewart, also known as A.T., came to the US from Ireland and ended up creating the largest department store ever at the time. He had accumulated over $1 million by 1876 which was unheard of. When he died in 1876 he was worth the equivalent of $90 billion.

#19 Henry Duke of Lancaster – $85.1 Billion

Henry Duke of Lancaster was an English nobleman who lived from 1310 to 1361 and acquired a net worth equivalent to $85.1 billion in modern dollars.

#20 Friedrich Weyerhauser – $80 Billion

Friedrich Weyerhauser made his first fortune in the timber business and then went on to acquire enough land to make him the largest private land owner in America. When he died in 1914, his estate was worth the equivalent of $80 billion in 2012 dollars.

#21 Jay Gould – $71 Billion

Railroad king Jay Gould amassed an impressive $71 billion net worth by the time of his death in 1892.

#22 Carlos Slim Helu – $68 Billion

Mexican business mogul Carlos Slim Helu's net worth peaked a few years ago at $68 billion. That made him the richest person on the planet for a little while. Unfortunately, even his peak net worth was not not enough to even crack the top 20 of the richest people of all time.

#22 Stephen Van Rensselaer – $68 Billion

Born in 1764, Stephen Van Rensselaer inherited one of the largest land grants in American history from his father. Stephen Van Rensselaer's family owned much of what would become New York State, including the island of Manhattan. During his lifetime his net worth peaked at $68 billion.

#23 Marshall Field – $66 Billion

Chicago based retail and real estate mogul Marshall Field was worth $66 billion, inflation adjusted, at the time of his death in 1906. Field coined the phrase "The customer is always right."

#24 Sam Walton – $65 Billion

At the time of his death in 1992, Sam Walton's net worth was $65 billion which he left to his widow and three children. Today the total value of that stock has grown to over $100 billion!

#25 Warren Buffett – $64 Billion

Billionaire investor Warren Buffett is probably not used to being the poorest guy in the room, but on this list that's exactly who he is. Buffett's peak net worth before he started giving all his money to charity was $64 billion which is enough to make him the 25th richest human being who ever lived.

Prior to launching Celebrity Net Worth, Brian spent seven years as the Managing Editor of one of the largest entertainment portals on the internet. Before that, Brian attended Georgetown University where he double majored in finance and marketing. A native of Northern California, Brian currently resides in Los Angeles. Follow him on Google+.